Vaillant ecoMAX 635, Instructions For Installation And Servicing

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General requirements 3
Instructions for installation and servicing ecoMAX
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Fig. 4.7 Fitting the pressure relief valve
4.11 Condensate drain (fig. 4.8)
Fig. 4.8
Connect the boiler condensate drain (1) to the condensate
discharge pipe (2) the condensate discharge pipe should
be minimum of 19mm internal diameter (22mm external
diameter for any pipework installed external to the pro-
perty) and be made of an acid resistant material (e.g. pla-
stic overflow pipe). The discharge pipe from the boiler
condensate drain must have a continuous fall (45mm per
metre) and preferably be installed and terminated within
the building to prevent freezing. The condensate dischar-
ge pipe must terminate in a suitable position, e.g.:
a)preferably the discharge pipe should be run and termi-
nate internally to the house soil and vent stack (at
least 450mm above the invert of the stack). A trap
giving a water seal of at least 75mm (3) should be
incorporated into the pipe run, and there must be an
air break (4) in the discharge pipe upstream of the
trap. This should be designed so that the condensate
cannot be discharged into the house if the condensate
pipe becomes blocked.
b)connecting into the internal discharge branch (e.g. sink
waste or washing machine) with an external terminati-
on, the condensate discharge pipe should have a mini-
mum diameter of 22mm with no length restriction and
should incorporate a trap with a 75mm (3) seal The
connection should preferably be made down stream of
the sink waste trap. If the connection is only possible
upstream, then a air break is needed between the two
traps. This is normally provided by the sink waste. c)
terminating in a gully (5) below grid level (6) and
above the water level. The external pipe length should
be kept a short as possible to minimize the risk of fre-
ezing and should not be more than 3m.
d)At a condensate absorption point (soakaway) (7). The
external pipe length should not be more than 3m
Fig. 4.9
Note!
If it is necessary to install any condensate
discharge pipework externally, then it should be
kept as short as possible to a maximum length
of 3m, be insulated with waterproof insulation
and have a continuous fall of a least 2.50 (i.e.
45mm for every metre length).
An optional siphon condensate discharge accessory is
available (Art. No. 2370104) and is for use where exter-
nal discharge pipework is very exposed and at risk of
freezing. This accessory is for installation within the con-
densate discharge pipework immediately below the boiler.
Refer to ‘BS 6798 Specification for installation of gas–
fired boilers of rated input not exceeding 70 kW net for
further information. Before operating the boiler the con-
densate trap (1, fig.4.9) must be filled with water as
described in relevant section.
1
Internal
stackpipe Internal
discharge system Gulley Soakaway
a b c d
1
2
3
5
6
3
7
4
80020014605_00GB_032006 22.02.2006 21:35 Uhr Seite 15